Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77fdd63e316552c…

MALICIOUS

PDF

50.2 KB Created: 2020-08-29 20:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81fa5e730e6eec196e9d6e141da10d4b SHA-1: f0ebe863e58c60c4c5e69548d2679fe1cff6f517 SHA-256: a77fdd63e316552c75997735812407f146bfd77e887193c601d142cc88db2fb2
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.club/wix?keyword=diary+of+a+wimpy+kid+the+meltdown', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the book title and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of numerous benign-looking PDF links alongside the malicious one is a common tactic to obscure the malicious intent.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=diary+of+a+wimpy+kid+the+meltdown
    • https://static.usrfiles.com/ugd/b8c837_98c42a7bebad40b3bb10e7c6e3deba65.pdf
    • https://static.usrfiles.com/ugd/b8c837_4985129fd57a4576b36b95f300dba106.pdf
    • https://static.usrfiles.com/ugd/b8c837_c70c5fef769446a9a699c2997dc841cc.pdf
    • https://static.usrfiles.com/ugd/97634b_9d7eda9448254492b5daa954e45b3461.pdf
    • https://static.usrfiles.com/ugd/b8c837_d607fefdf56643baa73d30d2d1e5e5af.pdf
    • https://static.usrfiles.com/ugd/a382ee_17bbe1277f7743e4b1a138bc24c52680.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4e04f21505544158beec3e0f7d96925.pdf
    • https://static.usrfiles.com/ugd/599026_92a7b1d0844641c291e02922b11da2ea.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.pdf
    • https://cdn.shopify.com/s/files/1/0436/5506/9849/files/welukuzadifelaxujonideli.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/dipikafitita.pdf
    • https://cdn.shopify.com/s/files/1/0438/3208/2594/files/high_wizard_build_guide_ragnarok_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0430/1714/2433/files/julite.pdf
    • https://static.usrfiles.com/ugd/b8c837_a52c3384528c42f8ad4560c85f05aa5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a1da7199a44c059a1aa85f7bc1cda8.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000875f.bin
1d1e1a7f47555ee2c2d40316705848159100b95c40b8090b42274d9f180e409c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x875F 5360 bytes
font_01_sfnt_off00009993.bin
6b61c2eb4819eee56a589eae494ece43cf717d3f3c3de7d38321574ebbf95326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9993 10120 bytes

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